The best way to keep your second generation (2008, 2009, 2010, 2011, 2012, 2013 & 2014) Smart Fortwo compact city car running reliably is to regularly change the motor oil and replace the oil filter on the Mitsubishi 3B21 1.0 liter DOHC three cylinder engine. Check out my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.